Shaking, rocking, and dumping grate



Dec. 2551928. 4 .1,696,463

C. R. WAID SHAKING, ROCKING, AND DUMPING GRATE Filed Oct. 23, 1925 a F15. l l /l 1 IML T if? L r i Hij L J La, IL

' C 1,596,463.-l P WENT orifice.,

CALYIN`R.WAID,. OF BIRMINGHAM, .ALASBAlVIAu` SHAKING, Rooxins, AND DUMPING yenivre'.

Y Application sied october 23, 192m serial No. sigel. l

My yinvention relates to kfurnace' grates suitablelor both locomotive and .stationar' f boiler service.

j The object of my present invention isto -design a grate made up oit pluralityof individual sections, each comprising a rocking assembly'itrame and a series of gratesegments interchangeably mounted therein.

lt is a distinctive `feature of my invention that the grate is designed to intcrpose' a ininimum obstruction to thelree distribi'ition and liowoi" air under and through it, and to this end l. dispose `the sides of the `frame at an angle upwardly towards the bridge Wall'V or flue sheet of thev boiler so that the frames tiansversefmeinbers :having a pitch in the ldirection of the flow of air will enable the air yto flow freely andalmost directly to the'ufire bed. Y s

lt is a further ldistinctive feature o-fmy invention that both the rocking', assembly iframe and thesegments therein are rrelatively shallow and substantially Wide, tothe end that they shall not project deeply belowk the lire bed and thereby interferevvith and im- `pode the iiow of the airunder the grates and through the lire, bed@ 'j f y It is a further distinctive feature of my invention that the assembly 'frame shall consist of an elongated substantially rectangular freinet the sides of which are spaoedwidely aj.v t so asto reducethe number otgrate units required toinake a ygrate of given dimensions, and in order to prevent a` light yframe of Jthis character from warping, I cause the grate segments that are. mounted threon to interlock with its/sides' and thus "form a plurality of intern'iediateframe'. braces. ,y

` lt is a further..distinctive `leaturefolimy invention that the; vgrate sections qand the asi senibly/ frame interlock Withside tongueand groove joints Whichlare set at an 4angle 'followingthe pitch ofthe iiiaine'sidesthat 'will more e'liectively brace the frame so subjected tosti-rains Wien being shaken. y

lt is a further distinctive eatureof my Viivention that the shaker arm is adapted to be interlocled with the assembly frame with out the use oibolts orother attachinents,;the

arm being preferably biiurcatedv so as to straddle a grate segment and notched to interv lock with the `frame sides between segments which hold it against lateral displacement.

`iframe showing only two completegrate S volition illustrated, Ishow a typical grate stitutes ajduinp grate in itsel'll and this en y ables me practically to dispense with dead grate suri'aces under boilers equipped with my invention.

A further 'distinctive feature oi my inven tion lies in the novel construction ol' ythe lire A heads loi the individual grate bar segments whichr are of arched Zig-Zag designywith their ends( straight. `They are 4so designed 65 thatby varying the thickness of metal in the cross Webs the amount of airspace `per square A foot of grate can be varied Within reasonable li1nitsand by lengtheningkthe straight ends the eect-iv'e Width of the unit canbe increased or decreased to lit dillerentsized lire boxes, all Without change in the standardassenibly 'iframe74 thusy simplifying the adaptation theljinvention to varioususes and reducing the amountof, equipment required to be stocked in order tosiipply gratos. for various purposes. 1

My inventiongurther comprises the novel y details of construction and arrangement, of parts, which in their preferred "embodiment only arehereinai'ter described and illustrated in the accompanying" drawings Which'forina part ofthis specilication, and in which Fig. `l is a iplan view" of my assembly ments mounted therein andfalso showingthe shalerfarm inposition, theVv other segments beingomitted forthe salie 'of clearness and heside bars or -rest barsy of the lire box being omitted, assame can be of any standard construction. 'i l i j i Fig.f2 isla.v cross-sectional view ron the line Figs. 8 and 4 are respectively, fragmental side and `plan `views of one end vOi a, grate. segment. H

Q Fig. 5 is a cross-sectional vievv't-alren on the i line of Fig. `l; and M vF10/2 6 .s a 'detail ieW of one of the inten partsthroughout the drawings.

According tojthe embodiment ol' my inunit which comprises an assembly frame having side members l and 2 cast integrally With thee-nd members 3 and 4e, thewhole constitutino'v a substantially rectangular relalt is a `further distinctive feature of my f invention that the assembly framefisso .degni-id. and sojmounted that each section conn the `rota-tio,nj` of disassembly traine Within j desired limits.- It will be observed that the sides of the frame, though they stand parallel, are pitched at an angle which is better observed in Fig. 2, and the sidev 2 of fthe Ytrame is always set towards the point of admission of the air, i. e., towards the front of the boiler. Each of the sides along its inner face carries a series of -equi-distantly spaced Shoulders 6 which are set opposite ach other on the two sides, are of equal thickness, and have the same pitch as the sides. In each side of each of these shoulders l provide a groove 7 which follows the pitch of the shoulder and extends from top to bottom thereof. Each side between the shoulde-rs G is reduced at 8 so as to leave pads 9 on each side. Each of the end walls is arched and provided with air vents 10 and 11 and has a Zig-Zag shape in plan which conforms to the shape of the grate barsegments which will nonv bel described.

Each grate bar segment is a casting comprising end members 12 and 13 which are each provided with side grooves 14 shaped kand disposed so that they will interlock by a rtongue and groove jointwith the shoulders 15 formed by the grooves 7 at the inner edges of the shoulders 6. Each end member carries a pair of spaced upper shoulders 16 and 17 which rest on the top edge of the assembly frame and project over same to form levelend portions of t-hc fire heads. These shoulders 16 on one end of the grate which overhang the wall 2 4of the assembly frame are made longer than the shoulders 17 which overhang the wall 1 and thus they compensate for the pitch of the grate segment and balance the weight of the fire bed on the assembly frame. The cndshoulders 16 and 17 of a grate segment are connected by arched webs 18 which are Zig-zag in plan view, as seen in Fig. 1, and these webs are spaced and arranged with their Zig-Zag walls parallel throughout. The segment parts have the requisite draft for the patterns to be drawn upwardly from the sand and the zig-zag end walls 3 and t of the assembly bar maintain a uniform spacing between them and the adjacent grate bar segments.

The segments when interlocked with the frame shoulders 6 will leave a space between them, as seen more clearly in Fig. 1, and I take advantage of the end portions of this space for the convenient mount-ing of the shaker arm on the assembly frame without the use of bolts, keys, or any likefastening device. As seen in plan view in Fig.` 1, the shaker arm is bifurcated and comprises two spaced wide upper arms 19 which merge into narron7 bottom legs 2O that are drawn close together and connected by an integral web 21 which spaces them sufficiently for a .shaker bar, not shown, to be received between them and connected thereto by a bolt passing through the holes The upper arms 19 are spaced on the samecenters as the shoulders 6 and each has its top edge deeply 1ndented or out away so as to 'droprbelow and clear most-tof the zigszasg portion of the webs 18 of adjacent segments, and each of the upper arms 19 is provided in its end walls, which conform in pitch to the walls 1 and 2 of the assemblybar, witha notch 23 shaped to straddle a shoulder 6. The shaker arm is mounted by inserting its arms 19 upwardly between adjacent pairs of shoulders 6 on each side of the frame and when its notches 23 comeinto position opposite the shoulders in the assembly bar it is shifted laterally, causing the notches to fit over the shoulders 6. -The arms are then shifted to central position on the shoulders, as shown in Fig. 1.,'and in' tliisposition they will` stand between the end of the grate segments that are mounted on the sides of shoulders that they are interlocked with and thus the shaker arm is secured to the assembly frame against displacement and yet without any fastenings. The vtop of `the shaker arms is deeply cut away s0 as'to drop it as low as possible below the fire be'd'thereby to prevent ashes or clinkers accumulating thereon, it being seen in Fig. 5 that it drops below the bottom arch of the adjacent grate bar segments. The segments are of substantially `uniform'height from topto bottom throughout their v'arched web portions 18, as seen more clearly in Fig. 2, whichre duces to al minimum the amount of metal in the segments and leavesno part of them underhanging lthe shallow assembly frame. This arch of the rebed, as the grate bar is rocked, will rub or sift out the ashes and small clinkers from lthe irebed resting thereon and the assembly framehasits trunnions so placed that it can rock down and dump without requiring a swinging drop grate or dump grate,'as each grate section in itself constitutes a dump grate.

By` making the connecting web 21 ofthe shaker arm triangular we avoid any possibility of it binding on the shaker bar and leaves the segmentv free ,to be .rocked tothe full eX- tent `required for dumping, whenever this is desired. A

Though I have described with great particularity the details of the embodiment of the invention herein shown, it is not to be construed that l am limited thereto, as changes in arrangement and substitution of equivalents may be made by those skilled in the art without departing from the invention as defined in the appended claims.

Having thus described my invention, what I claim as new and desire to 'secure by Letters Patent, is

1. A grate unit comprising an assembly frame having end trunnions and spaced side walls, opposed shoulders provided on the inner side of said side walls, grate segments adapted to intert with said shoulders and to llO span the frame, and a rocking arm having' its top side portions notched and adapted to be received between the shoulders and bylateral movement to engage an opposite pair of shoulders in its notches.

2. A grate unit comprising a substantially rectangular assembly frame having spaced shoulders on the inner Wall of its sides, a shaker arm bifureated at itstop and having end notches in its upper ends, said notches being' adapted to interlock with said opposed shouldersj and said ends being spaced on corresponding centers With the shoulders, land grate segments which are mountable onV the frame between and on each side ofy said up; per ends of the shaker arm to hold it in position free of any other fastening means than the engagement between itsnotclied portions and the shoulderson the frame.

In testimony whereof IaIiX my signature.

CALVIN R. WAID'. 

